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Gevolgen van ABR in het milieu voor de volksgezondheid

7 Discussie en conclusie

7.3 Gevolgen van ABR in het milieu voor de volksgezondheid

Uit dit rapport blijkt dat ABR in het milieu wordt gebracht via afvalwater en mest. Mensen kunnen in meerdere of mindere mate aan ABR in milieucompartimenten worden blootgesteld. Een voorbeeld zijn ESBL- producerende bacteriën in recreatiewater onder invloed van afvalwater waarbij het zeer aannemelijk is dat mensen worden blootgesteld (Schijven et al., 2015).

Naast blootstelling aan ABR via het milieu vindt blootstelling aan ABR ook via vele andere routes plaats, zoals direct contact met mensen of dieren, door voedselconsumptie of bij een ziekenhuisopname. Omdat ABR via vele routes van en naar de mens overgedragen kan worden, is onderzoek naar de precieze bijdrage van alle verschillende bronnen complex van aard. Deze kennis zal naar verwachting ook niet binnen afzienbare tijd ter beschikking komen.

Voor enkele andere pathogenen bestaat al meer kennis over de bijdrage van verschillende routes, en is inzichtelijk dat overdracht via het milieu mogelijk is. Voor Campylobacter, Salmonella en shiga toxine

producerende E. coli werd geschat dat blootstelling via water ongeveer 10% van de blootstelling kan verklaren, naast blootstelling via voedsel (Hald et al., 2016). Ook zijn de risico’s verbonden met enkele specifieke routes van overdracht van resistente bacteriën onderzocht, zoals reizen naar bijvoorbeeld Azië of Zuid-Amerika (Arcilla et al., 2017; Paltansing et al., 2013), ziekenhuisopnames of overdracht tussen leden van een huishouden (Haverkate et al., 2017). Voor de bacterie MRSA, maar niet voor ESBL-EC, werd recent een lichte verhoging van het dragerschap onder omwonenden van veehouderijen aangetoond (Maassen et al., 2016). Samenvattend is over de mate van blootstelling via het milieu in relatie tot deze andere bronnen nog weinig bekend.

Ook studies naar de mogelijke gevolgen van blootstelling aan ABR in het milieu voor de volksgezondheid zijn vooralsnog niet beschreven, zoals ook werd geconcludeerd door Huijbers et al. (2015). De complexiteit van de keten blootstelling, kolonisatie, en ziekte speelt daarin een rol:

van infecties. Mensen kunnen deze bacteriën ook bij zich dragen zonder ziektes te ontwikkelen. Deze relatie tussen blootstelling aan resistente bacteriën en ontwikkeling van ziekteverschijnselen is voor blootstelling aan ABR in het milieu net zo onbekend als voor andere

blootstellingroutes, zoals consumptie van vlees of direct contact met dieren of mensen.

Het is van belang om te weten of blootstelling aan ABR in het milieu leidt tot nadelige gevolgen voor de volksgezondheid. Bovendien is het van belang te weten in welke mate dit gebeurt en hoe omvangrijk de gevolgen zijn, om beter af te kunnen wegen in welke mate maatregelen nodig zijn om de blootstelling aan ABR te verminderen. In algemene zin is het voorkomen van verspreiding van ABR naar het milieu wenselijk. Methoden om de gezondheidsgevolgen van blootstelling aan ABR te onderzoeken omvatten epidemiologische studies naar dragerschap van ABR in mensen die via een bepaalde route zijn blootgesteld,

kwantitatieve analyses van de blootstelling aan resistente bacteriën, en ziektelastschattingen. Verschillende strategieën om de ernst en impact door blootstelling aan ABR in het milieu te kwantificeren worden in Bijlage 9.12 nader beschreven.

Op korte termijn bieden epidemiologische studies van mensen die via een bepaalde route aan ABR in het milieu zijn blootgesteld (zoals door zwemmen in oppervlaktewater of door beroepsmatige blootstelling) de mogelijkheid om gevolgen van blootstelling voor dragerschap van BRMO te onderzoeken. Ook kan de opname van ABR via verschillende

blootstellingsroutes onderzocht worden. Dit kan helpen om het relatieve belang van verschillende blootstellingsroutes te vergelijken.

8

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